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Table 4 Side effects of opioid usage and block technique

From: Ultrasound-guided erector spinae block for postoperative analgesia in thoracotomy patients: a prospective, randomized, observer-blind, controlled clinical trial

Side effects Group ESP Group C Test p value
Nausea 2 (6.66%) 9 (30%) Z = 2.33 0.01
Vomiting 1 (3.33%) 6 (20%) Z = 2.01 0.04
Pruritus 2 (6.66%) 5 (16.66%) Z = 1.2 0.22
Sedation 2 (6.66%) 8 (26.66%) Z = 2.07 0.03
Hypotension 2 (6.66%) 5 (16.66%) Z = 1.2 0.22
Bradycardia 2 (6.66%) 5 (16.66%) Z = 1.2 0.22
Pain on injection 5 (16.66%) 0 (0%) Z = 2.33 0.01
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